Grade attachment for transits.



. G. A. SCOTT. GRADE ATTACHMENT FOR TRANSITS. APPLICATION FILED MAY 9,1912.

1,105,930, Patented Aug. 4, 19M

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THE NORRIS PETERS Ca. FHOTQ-LITHO WASHINGTON. D, Cv

C. A. SCOTT. GRADE ATTACHMENT FOR TRANSITS. APPLICATION TILED MAY9,1912.

l, 1 05,930. Patented Aug. 4, 1914,

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FHE NORRIS PETERS CQ, FHOTO LITHCZ. WASHINGTON. D. C

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GRADE ATTACH1VIENTFOE TRANSITS.

Specification of Letters Patent.

Application filed May 9, 1912. 1 Serial No. 696,120.

To all whom it mug concern Be it known that I, CHESTER A. Soorr, acitizen of the United States, residing at Stockton, in the county of SanJoaquin,

' State of California, have invented certain transits used for surve in"and en 'ineerin j purposes, the object of theinvention being to producean attachment for ordinary. iiIiLIlSlilS used for leveling purposeswhich will provide a means, formed as a component part of theinstrument, for contour and grading purposes.

The invention further embodies certain means for attaching the grade andcontour telescope and its frame to the frame of the level transit. Suchgrade and contour attachment has certain lever attachments for thepurpose of operating and adjusting the same which are cooperativelydisposed upon its frame.

A further object ofthe invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly effcctive for the purposesfor which it is designed.

These objects, I accomplish by means of such structure and relativearrangement of the parts as will fully appear by a perusal of thefollowing specification and claims.

On the drawings similar characters of reference indicate correspondingparts in the several views.

Figure 1 is aside elevation of the level transit showing the grade andcontour attachment mounted thereon. Fig. 2 is a side elevation of thegrade and contourfattach= merit. Fig. 3 is a sectional view of theadjustment mechanism for the grade and contour attachment.

Referring now more particularly to the characters of reference on thedrawings, the numeral 1 designates the supporting base for the leveltransit, while the numeral 2 designates the side supporting framestherefor and the numeral 3 designates the telescope disposed in saidframes 2.

In applying my improved invention, I first provide a hub member 4 havingan end flange 5, such member 4; beingprovided with a threaded recess 6adapted to screw onto the end of the spindle of the telescope 3. Mountedcompletely over the hub i is a sleeve 7 formed as a component part ofwhich is a platform 8 having an upwardly projecting threaded pin 9.

The numeral 10 designates a supporting frame having a sleeve 11 screwmounted on the pin 9 in which frame 10 is pivotally mounted the grade orcontour telescope 12. Mounted on the outer end of the spindle of thetelescope 12 is a tangent arm 13 having adjustable pins 1 .1: adapted toimpinge against a lug 15 on the frame 10, such adj ustment pins being ofthe usual type used for such adjustment and one of them beingjprovidedwith a thumb screw 16 for this purpose. On

the lower end of the sleeve 7 and formed as a component part thereof isa 180 degree are 17 movable over a Vernier 18 secured to a steady brace19 having a collar 20 disposed over the sleeve 7 such steadv brace 19being I secured at its lower end by means of adjust ment screws 21adaptcdto impinge against the frames 2. Mounted onthe sleeve 7 isanother collar 22 formed as a component part of which are tangent arms23 having adjustment screws or pins 2 1 impinging against a hip; 25 onthe steady brace 19. A set screw 26 projects through the collar 22 andis adapted to engage thc slecve 7 when desired for a purpose as willappear.

Projecting from the hub 1 is a threaded pin 27 screw mounted on which isa cap 28 having a flange 29 adapted to abut against the member 22 tohold said members 22, 20 and T against the flange W hen in this po-;sition asshownin Fig. 3, the cap 28 is then at the ends of the threadson the pm 27 and thereafter any further turning movement of "the cap 28will alsoturn the hub 4: for the purpose of screwing the'same' upon thespindle of the telescope 3 for the purpose of fixing the sameupon saidspindle or for adjustment purposes as may bedesired. A spring 30 isinterposed between the cap 28 and the member 22110 maintain the saidparts in a steady position.

Patented .All". 4t, 1914;.

In operating my improved attachment, the are 17 may be turnedto anydesired point, the same, and the vernier 18 being vpr0- vided with anysuitable designations to in dicate the diiferent points desired (thisdesignation not being shown for the reason that it is old and well knownin the art). The position of the telescope 12 would then be changedaccordingly for the reason that it is a component part of said are 17,as described. The said telescope 12'and its frame in practice would beprovided with the usual balancing structure commonly used withtelescopes of this character and no showing of the same has been madeinthis specification as the same forms no part of my invention. Afterthe are 17 has been turned and a finer adjustment is desired, then theset screw 26 is operated to impinge against the collar 7 which thenforms the members 22 and 23 as a fixed part with respect to said sleeve7.

Then by the movement of the adjustment screws 24:, the members 23 and 22and incidentally the-sleeve 27 and its connected telescope 12 may beadjusted with exactness to any desired position. Then a still, fineradjustment of the telescope 12 may. be had by the operation of thethreaded screw 16 which moves the tangent arms 13 one way or the other,as desired, and incidentally moves "the telescope 12 for the reason thatthe arms 13 are mounted on-the spindle of said telescope12, asdescribed.

The steady brace 19 as will be seen holds the Vernier steady under allconditions and can be adjusted to any desired position by means of theset screws or pins 21. From the foregoing description it can be readilyseen that I have designed such an attachment as may beappliedto thespindle of the telescope of any transit, which attachment can be usedfor different purposes than the transit, and especially for grade andcontour work as set forth herein. It will be especially noted that Ihave shown none'of j the scaling or indicating points ornumeralscommonly used on instruments of this kind as the same could beofany desired type and I do not claim the same as a necessarycombination" for my improved mechanical: at: tachment. r

While this specification sets forth in de'- tail the present andpreferred construction of the device, still in practice such deviationsfrom such detall may be resorted to Gopiesof'this patent may; beobtaiiied for five cents each, by addressing the Commissioner of ZPa1:ent s.

as do not form a departure from thespiritv of the invention.

Having thus described myinvention what I claim as new and useful anddesire to. se-

cure by Letters Patent is: i,

'1. A device of the character described comprising the combination witha transit,

of anattachment adapted to be mounted on said transit, such attachmentcomprising a hub, a sleeve mounted on said hub, a'telescope carryingframe mounted on said sleeve, an are mounted on said sleeve, andmeansfor adjusting theposition of said sleeveion said hub, as described.

'2. A device of the character describedcomprising; the combination witha transit, of an attachment adapted to be mounted on said transit, suchattachment comprising a" hub, a sleeve mounted on said hub, a tele-rscope carrying frame mounted on' said sleeve, a steady bar mounted onsaid sleeve,

a tangent levermounted on' said sleeve,

comprising the combination with a transit,

of an attachmentadapted to be mounted on said translt, such attachmentcomprising a hub, a sleeve mounted on said hub,'a telescope carryingframe on said sleeve, a tangent leverhavmg a collar mounted on saidsleeve, and a set screw dlsposed through said collar and adapted toimpinge against said sleeve, as described; 1

4?- A device of the character of an attachment adapted to be mounted onsaid transit, such attachment comprising a hub, a sleeve mounted on saidhub,a collar mounted on said sleeve, steady bar on-said collar, anothercollar mounted on said sleeve, a tangent lever disposed on said secondnamed collar, means for-fixing said second named collar stationary withrespect to said sleeve, and a cap screw mounted on the end o-fsa'id huband adapted to hold said collars in position on said sleeve, asdescribed.

In testimony whereof I aflix my signature in presence of two witnesses.1'

' CHESTER A. SGOTTL VVitne'sses STEPHEN N; BLEWETT, CLARENCE SMITH.

. Washington, D. 0.

described comprising" the combination with a tIELIlSllZ,

